As i understood Hibernate uses its own collections implementation,
the same does the Struts framework.
How can i use them together?
Is there any combined collections library?
(I use Hibernate 2.1.2 and Struts 1.1)

Hibernate respect the Collection interfaces, so there is no need for special synchronisation here. It's just like if you choosed a Hash implem vs an other one in the java.util package

Thanks a lot. I got it. I just was confused that my Hibernate 2.1 library has commons-collections-2.1.jar and Struts has commons-collections.jar and they are different versions. Now i understand that it's just a realization of standard classes/interfaces from apache. And i must use the one that has older version. Am I right?

No I would recommand you the commons-collection 2.1 usage.

Thanks again. You really helped me.